APT 8KW - Single-Phase Parallel Operation

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6. Parallel Installation Guide
6.1Parallel Operation Cable
1. Recommended battery cable and terminal size for each inverter:
Model
Typical
Amperage
Battery
capacity
Wire Size
Cable mm2
Ring Terminal
Torque
value
Length
Dimensions
D (mm) L (mm)
8KW 190.5A
100AH 1AWG 50
8.4 51 5 Nm 1M
200AH 1/0AWG 70
WARNING: Be sure the length of all battery cables is the same. Otherwise, there will be voltage difference
between inverter and battery to cause parallel inverters not working.
2. Recommended breaker specification of battery for each inverter:
Model 1 unit*X
8KW 250A70Vdc
If you want to use only one breaker at the battery side for the whole system, the rating of the breaker
should be X times current of 1 unit. “X” indicates the number of inverters connected in parallel.
3. Recommended AC input and output cable size for each inverter
Model Gauge Torque Value
8KW 8 AWG 1.4~ 1.6Nm
Model 2 units 3 units 4 units 5 units 6units
8KW 120A/230VAC 180A/230VAC 240A/230VAC 300A/230VAC 360A/230VAC
Note 1: Also, you can use 60A breaker with only 1 unit and install one breaker at its AC input in each inverter.
Note 2: Regarding three-phase system, you can use 4-pole breaker directly and the rating of the breaker
WARNING: Regarding AC input and output, please also follow the same principle. should be compatible with
the phase current limitation from the phase with maximum units.
6.2 Matters Needing Attention In Single-phase Parallel Operation
1. Parallel operation in single phase with up to 6 units.
2. WARNING: It’s required to connect battery for parallel operation, it is forbidden to use parallel without
batteries
3. WARNING: It is forbidden for inverter to share the same solar panel group.
4. WARNING: Make sure all cables are of the same length, Otherwise, there will be voltage difference
between inverter and battery to cause parallel inverters not working.
5. Set the parameters of each inverter separately (working mode, single - phase parallel function).
Warning: When working in parallel, the working mode of each inverter must be the same working mode,
output frequency.
6. After setting the parameters, turn on each inverter in turn.
7. WARNING: When running in parallel, all inverters must share the battery pack.